Nice catch and pics Rug!
Those pug nose stripers are genetic mutations. Possibly caused by low oxygen concentrations in the water, pollution or a recessive gene that appears occassionally. They have ruled out any type of physical injury or damage to the fish or embryos. Definitely more rare than common to catch one of them.
There is a guy, Charlie Cinto, from Massachusetts that has a "famous" pug nose mount. He also has a monster 73lb striper mounted from a 1967 catch. I saw his display, years ago at an expo I attended...very impressive!